World Register of Marine Species (WoRMS)
WoRMS (2026). Catharacta skua Brünnich, 1764. Accessed at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=137170 on 2026-08-24
Brünnich, M. T. (1764). Ornithologia borealis, sistens collectionem, avium ex omnibus, imperio Danico subjectis, provinciis insulisque borealibus Hafniæ factam, cum descriptionibus novarum, nominibus incolarum, locis natalium et icone. Hafniæ. (J. C. Kall). pp. [1-7], 1-80, 1 pl.